Issues in relation to which referendums are optional at the national level

Ukraine
- Constitutional amendments
- Adoption of international treaties
- Transfer of authority to international bodies
- Change of Laws
Law of Ukraine on all-Ukrainianand Local Referendums
http://www.legislationline.org/documents/action/popup/id/7114
ARTICLE 3. Subject - Matter of All-Ukrainian Referendum.
Thesubject-matter of All-Ukrainian referendum can be:
- confirmationof the Constitution of Ukraine, its separate provisions, as well asintroduction of changes and amendments to the Constitution of Ukraine;
- adoption,change or cancellation of Laws of Ukraine or their separate provisions;
- adoption ofdecisions which determine the principal content of the Constitution of Ukraine,Laws of Ukraine, and other legislative Acts.
ARTICLE 5. Questions Submitted to All-Ukrainian Referenda.
Questionsattributed by the Constitution of Ukraine to Ukrainian jurisdiction can besubmitted to All-Ukrainian referendum.
Questions onrealization of Ukrainian people' s right to self-determination and joiningfederative or confederative state formations, as well as leaving them may besubmitted to All-Ukrainian referendum only.